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Mac clients unable to authenticate to SMTP

Document ID: 10092

Synopsis

Mail Server does not understand request.

More Information

Mac clients unable to authenticate to SMTP Mail Server does not understand request.

This issue is more apparent to Macintosh users, which the e-mail client tries to Authenticate the connection with NTLM. If you are using NT Mailboxes then you should not have this problem, but if you are using Registry or Database mailboxes, then you will need to do the following.

  1. Open the MailSite root folder and locate a file called: msspiauth.dll
  2. Rename the file to: MSSPIAUTH.BAK
  3. Stop and Restart the MailSite service.
Macintosh users should be able to authenticate their connections. Making this change will remove the NTLM capabilities of ALL the MailSite services.